EP0191664A1 - Vakuumkolben für Röntgenbildverstärkerröhre - Google Patents

Vakuumkolben für Röntgenbildverstärkerröhre Download PDF

Info

Publication number
EP0191664A1
EP0191664A1 EP86400055A EP86400055A EP0191664A1 EP 0191664 A1 EP0191664 A1 EP 0191664A1 EP 86400055 A EP86400055 A EP 86400055A EP 86400055 A EP86400055 A EP 86400055A EP 0191664 A1 EP0191664 A1 EP 0191664A1
Authority
EP
European Patent Office
Prior art keywords
aluminum
central body
window
brazed
vacuum envelope
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86400055A
Other languages
English (en)
French (fr)
Other versions
EP0191664B1 (de
Inventor
Gilbert Colomb
Maurice Verat
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0191664A1 publication Critical patent/EP0191664A1/de
Application granted granted Critical
Publication of EP0191664B1 publication Critical patent/EP0191664B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/26—Sealing together parts of vessels
    • H01J9/263—Sealing together parts of vessels specially adapted for cathode-ray tubes

Definitions

  • the present invention relates to a vacuum envelope for an X-ray image intensifier tube.
  • Vacuum envelopes for radiological image intensifier tubes essentially comprise a central body of revolution, the ends of which are terminated by an entry window intended for the passage of the radiation to be intensified and by an exit window for visible radiation.
  • entry windows were usually made of glass, which posed few problems of sealing with the central body even when it was made partly of ferrous metal, because glass-metal seals are well known to those skilled in the art.
  • the use of glass for entry windows poses a number of problems.
  • the absorption of radiation, in particular X-ray radiation, and the diffusion of the radiation are very important and increase with the size of the tube.
  • the use of a glass entry window therefore results in a considerable limitation of the performance of the tube such as contrast, resolution, etc.
  • the tube inlet screen being convex for the purposes of electronic optics, if a concave window is used, the tube must be lengthened by an amount equal to the arrow in the inlet window. However, this arrow is all the more important as the field of entry of the IIR is larger.
  • the tube entry plane moves away from the entry screen. Due to the conical projection from the focal point of the X-ray tube, the actual input field of the tube, measured in the input plane, is reduced compared to the useful field of the input screen.
  • the sealing between the window and the central body can be carried out by thermo-compression welding. There is diffusion in the solid state of the aluminum of the window and of a metallic coating deposited on the ferrous metal of the central body, at a temperature lower than that of their fusion. The contact surfaces must be flat, thereby excluding the type of cylinder-on-cylinder geometry.
  • the convex aluminum or aluminum alloy window has an annular peripheral flange and the assembly between the window and the body requires either that the body has an annular flange perpendicular to the axis of the tube, or use of an L-shaped or S-shaped connection ring
  • Another solution of the prior art consists in using a convex window having a copper layer plated on an aluminum layer in which the copper layer is removed in the part subjected to radiation and the aluminum layer is removed on the periphery of a flat surrounding the convex cap, reserving a localized overlap of the two layers.
  • the copper is then welded by electric arc welding along a lip resealed on the central metallic body which can be made of stainless steel.
  • the object of the present invention is to provide a new vacuum envelope structure for an X-ray image intensifier tube comprising a window which does not have the drawbacks of prior art windows.
  • the object of the present invention is also to provide a new vacuum envelope structure for an X-ray image intensifier tube which is easy and quick to produce.
  • the present invention relates to a vacuum envelope for an X-ray image intensifier tube comprising an inlet window secured to a central body of ferrous alloy, characterized in that the inlet window is made of an aluminum alloy, and of series 5000 magnesium and is embedded in an aluminum part, of the 1000 series, to which it is welded, this part being brazed by brazing with the aluminum-silicon or aluminum-silicon-magnesium eutectic to the central body.
  • Figure 1 is a longitudinal sectional view of a radiological image intensifier tube comprising a vacuum envelope according to an embodiment of the invention.
  • the part 1 designates a part of the central body of revolution. This part consists of a glass cylinder ending in an exit window also made of glass.
  • the glass cylinder is welded to an intermediate ring 2.
  • This intermediate ring is made of iron or an iron alloy, preferably an iron-nickel-cobalt alloy such as the Dilver or an iron-nickel alloy such as the Carpenter .
  • the intermediate ring is provided to facilitate welding on the glass cylinder in particular, when the rest of the central body of revolution 3 is made of stainless steel.
  • the parts 2 and 3 may constitute only one piece when they are made of the same material.
  • the main elements constituting the radiological image intensifier tube such as the scintillator and the photocathode, which have the reference 4, the acceleration and focusing electrodes 5, have been shown diagrammatically inside the envelope. the output screen 8, and the last electrode or anode 9.
  • the entry window 10 is made of an aluminum and magnesium alloy of the 5000 series, such as for example 5086 or AG 4 MC.
  • the series in question is defined, like many others, by American standards well known to specialists. These alloys are rigid enough to withstand the mechanical stresses due to the difference in pressures existing between the inside and the outside of the tube.
  • THE G. MC is the most efficient alloy from a mechanical point of view for this application.
  • the window 10 made of aluminum and magnesium alloy it is not possible to directly solder the window 10 made of aluminum and magnesium alloy to the ferrous alloy of the central body of revolution because the melting range of the window, for example in the case where it is made of AG 4 MC, extends from 580 to 6 4 0 °, that is to say in the brazing interval of the eutectic AI - Si at 89% which allows the brazing between aluminum and its alloys and ferrous alloys.
  • the entry window 10 therefore fits into an aluminum part 11 of the 1000 series, such as for example the 1050 A or A5, as can be seen in FIG. 1.
  • the window 10 and the part 11 are welded, for example by TIG (Tungsten Inert Gas) welding in alternating current and under a helium atmosphere, to obtain a good vacuum seal.
  • TIG Tungsten Inert Gas
  • FIG. 1 it can be seen that a groove is provided in the part 11 to allow the part 10 to be embedded.
  • the part 11 which is of aluminum of type A s for example, can be brazed to a part 12 of ferrous alloy which forms part of the central body of the tube. It is an aluminum-silicon eutectic solder, around 585 ° C or an aluminum-silicon magnesium eutectic solder. This solder makes it possible to make the parts 11 and 12 integral in a vacuum-tight manner.
  • the window 10 is then fitted into the window and welded to the part 11. Then the window 10 and the parts 11 and 12 are assembled to the rest of the central body of ferrous alloy, for example by Argon-Arc welding.
  • the machining must be done with some precautions to be safe for soldering.
  • the part 12 is machined before being brazed to the part 11.
  • a method of manufacturing a vacuum envelope according to the invention therefore consists in assembling a part 11 of aluminum of type A 5 to a part 1 2 of ferrous alloy.
  • This process is simple, fast and easily industrializable.
  • FIGS 2 to 5 show various alternative embodiments of the vacuum envelope according to the invention.
  • FIG. 2 shows in more detail the embodiment of FIG. 1.
  • the piece 11 of type A aluminum 5 is brazed to a piece 12 of ferrous alloy, of substantially cylindrical shape, and terminated by a circular crown 13.
  • the circular crown 13 is brazed to the piece 11, which has substantially the shape of a circular crown.
  • This brazing consists in melting a "joint" 1 4 of brazing, at a suitable temperature, by all known means, for example in an oven, by high frequency losses in the parts to be assembled, by electronic bombardment. This fusion can take place under a controlled, reducing or neutral atmosphere, or under vacuum.
  • This brazing can also be carried out by indirect HF induction as described below.
  • the two surfaces to come into contact receive a layer of aluminum solder.
  • the assembly is placed on a metal mandrel surmounted by a support plate made of asbestos cement and preheating to 180 ° C is carried out .
  • a ferro-magnetic steel disc 0.6 mm thick is deposited on the assembly, which is commonly designated by the term "susceptor".
  • the suceptor is heated by induction and transmits heat by conduction.
  • the melting temperature of the Aluminum-Silicon eutectic It regulates the melting temperature of the Aluminum-Silicon eutectic by placing it at the Curie point of the material that constitutes it.
  • the brazing operation takes place while the assembly is tightened under high pressure.
  • the duration of this pressurization and that of the heating of the susceptor are determined according to the dimensions of the parts. On average, the duration of pressurization is more than double the duration of heating of the susceptor.
  • the temperature is around 580 ° C.
  • the susceptor is removed and the two brazed parts are immersed in water at room temperature, which makes it possible to remove a large part of the flux by detachment. The rest of the flux is removed by mechanical action and by chemical treatment.
  • FIGS 3, 4 and 5 show various variants of the envelope according to the invention.
  • the part 11 has a substantially conical shape, with a slight slope.
  • the central body ends in a part 12, of substantially conical shape, with a slight slope.
  • the solder 14 is distributed between the two surfaces facing the parts 11 and 12, which are substantially conical, and have a slight slope.
  • the part 11 has substantially the shape of a circular crown and the central body ends in a cylindrical part 12, the end of which is brazed to the part 11.
  • FIG. 5 represents another variant of the envelope according to the invention in which said part 11 has substantially the shape of a circular crown.
  • the central body ends in a substantially cylindrical part 12 to which another substantially cylindrical part 15 is welded, ending in a circular ring 16 brazed to said part 11.
  • This variant allows brazing to be carried out without significantly modifying the parts usually used to make the intensifiers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
EP86400055A 1985-01-15 1986-01-10 Vakuumkolben für Röntgenbildverstärkerröhre Expired - Lifetime EP0191664B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8500524A FR2576146B1 (fr) 1985-01-15 1985-01-15 Enveloppe sous vide pour tube intensificateur d'images radiologiques
FR8500524 1985-01-15

Publications (2)

Publication Number Publication Date
EP0191664A1 true EP0191664A1 (de) 1986-08-20
EP0191664B1 EP0191664B1 (de) 1990-06-20

Family

ID=9315295

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86400055A Expired - Lifetime EP0191664B1 (de) 1985-01-15 1986-01-10 Vakuumkolben für Röntgenbildverstärkerröhre

Country Status (5)

Country Link
US (1) US4721884A (de)
EP (1) EP0191664B1 (de)
JP (1) JPS61168848A (de)
DE (1) DE3672173D1 (de)
FR (1) FR2576146B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0563903A1 (de) * 1992-03-31 1993-10-06 Kabushiki Kaisha Toshiba Röntgenbildverstärker

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5594301A (en) * 1994-06-30 1997-01-14 Hamamatsu Photonics K.K. Electron tube including aluminum seal ring
US5705885A (en) * 1994-11-25 1998-01-06 Kabushiki Kaisha Toshiba Brazing structure for X-ray image intensifier
DE19734915C1 (de) * 1997-08-12 1999-03-04 Siemens Ag Röntgenbildverstärker mit Aluminiumeingangsfenster sowie Verfahren zu seiner Herstellung
JP3756681B2 (ja) * 1997-11-21 2006-03-15 東芝電子エンジニアリング株式会社 放射線イメージ管およびその製造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1339039A (fr) * 1962-09-25 1963-10-04 Thomson Houston Comp Francaise Méthode et appareil de jonction et de brasure dans le vide et en compression
GB2006518A (en) * 1977-10-24 1979-05-02 Philips Nv Image intensifier tube
FR2482366A1 (fr) * 1980-05-06 1981-11-13 Tokyo Shibaura Electric Co Enveloppe sous vide pour un tube multiplicateur d'images de rayonnement, et son procede de fabrication

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5135942A (en) * 1974-09-24 1976-03-26 Hitachi Ltd Koryuerebeeta no seigyosochi
JPS5261782A (en) * 1976-04-07 1977-05-21 Chugoku Electric Power Line spacer for salttproofing
DE2619293C3 (de) * 1976-04-30 1979-02-01 Siemens Ag, 1000 Berlin Und 8000 Muenchen Strahlendurchgangsfenster, insbesondere für Röntgenbildverstärker
JPS56167246A (en) * 1980-05-26 1981-12-22 Toshiba Corp X-ray image intensifier and its manufacturing method
JPS59158059A (ja) * 1983-02-28 1984-09-07 Shimadzu Corp Ｘ線イメ−ジ管

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1339039A (fr) * 1962-09-25 1963-10-04 Thomson Houston Comp Francaise Méthode et appareil de jonction et de brasure dans le vide et en compression
GB2006518A (en) * 1977-10-24 1979-05-02 Philips Nv Image intensifier tube
FR2482366A1 (fr) * 1980-05-06 1981-11-13 Tokyo Shibaura Electric Co Enveloppe sous vide pour un tube multiplicateur d'images de rayonnement, et son procede de fabrication

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 9, no. 8 (E-289) [1731], 12 janvier 1985; & JP - A - 59 158 059 (SHIMAZU SEISAKUSHO K.K.) 07.09.1984 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0563903A1 (de) * 1992-03-31 1993-10-06 Kabushiki Kaisha Toshiba Röntgenbildverstärker
US5359188A (en) * 1992-03-31 1994-10-25 Kabushiki Kaisha Toshiba X-ray image intensifier

Also Published As

Publication number Publication date
DE3672173D1 (de) 1990-07-26
EP0191664B1 (de) 1990-06-20
JPS61168848A (ja) 1986-07-30
FR2576146B1 (fr) 1987-02-06
US4721884A (en) 1988-01-26
FR2576146A1 (fr) 1986-07-18

Similar Documents

Publication Publication Date Title
FR2778017A1 (fr) Procede de fabrication d'un intensificateur d'images de rayons x, et intensificateur d'images de rayons x fabrique par ce procede
US4423351A (en) Vacuum container of radiation image multiplier tube and method of manufacturing the same
FR2484137A1 (fr) Enveloppe sous vide avec une fenetre permeable aux rayonnements et son procede de fabrication
EP0191664B1 (de) Vakuumkolben für Röntgenbildverstärkerröhre
FR2504044A1 (fr) Procede pour fabriquer un raccord tubulaire composite pour abouter des tubes metalliques non soudables entre eux et raccord ainsi obtenu
EP0099285B1 (de) Scintillations-Strahlenumwandlungsschirm und Verfahren zur Herstellung desselben
FR2655191A1 (fr) Anode pour tube a rayons x.
EP0165851B1 (de) Vakuumkolben für Strahlungsbildverstärker und Verfahren zu seiner Herstellung
EP0714116B1 (de) Röntgenbildverstärker und dessen Herstellungsverfahren
EP0231778B1 (de) Abgeschlossener Gaslaser
EP0615074B1 (de) Aus Blöcken bestehender Bremsbelag mit verbesserter Befestigung dieser Blöcke
EP0367652B1 (de) Elektronische Röhre kompakter Bauweise und Herstellungsverfahren derselben
EP0061368A1 (de) Element von homokinetischer Tripodekupplung
FR2565141A1 (fr) Dispositif pour le guidage et l'alimentation electrique d'un fil de metal d'apport pour le soudage a l'arc, et son procede de fabrication
WO2002091420A1 (fr) Tube a rayons x avec fenêtre en graphite
EP0430768A1 (de) Röntgenröhrenanode mit mehrteiligem Trägerkörper
FR2553688A1 (fr) Procede de fixation d'un tube capillaire et dispositif pour la mise en oeuvre du procede
US4820225A (en) Method of sealing a pump stem to a cathode ray tube envelope part
FR2518801A1 (fr) Grille en graphite pyrolytique munie d'un support de fixation et son procede de realisation
FR2594595A1 (fr) Enveloppe sous vide pour tube intensificateur d'images radiologiques et procede de fabrication d'une telle enveloppe
FR2556123A1 (fr) Procede pour realiser un passage electrique etanche a travers une paroi
JPH0216505Y2 (de)
JPH05171439A (ja) 真空窓
JPH0917362A (ja) Ｘ線イメージ増強管及びその製造方法
JPS59158059A (ja) Ｘ線イメ−ジ管

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE GB NL

17P Request for examination filed

Effective date: 19870116

17Q First examination report despatched

Effective date: 19880329

RAP3 Party data changed (applicant data changed or rights of an application transferred)

Owner name: THOMSON-CSF

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB NL

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 3672173

Country of ref document: DE

Date of ref document: 19900726

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19951220

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19970110

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19970110

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20040121

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20040122

Year of fee payment: 19

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050801

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050802

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20050801